I never used the ghc profiler before, when I try to compile the program with: ghc -prof -auto -O2 -o Main --make Main.hs I get: Could not find module `Data.Binary.IEEE754': Perhaps you haven't installed the profiling libraries for package `data-binary-ieee754-0.3'? Use -v to see a list of the files searched for. Is there a way to tell the profiler to ignore the external libraries or I have to recompile all the libraries with profiling enabled? thanks